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Search Results: 1 - 10 of 119731 matches for " 沈建忠 "
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国际大洋钻探计划研究方向与钻探目标

地球学报 , 1999,
Abstract: 从地球环境动力学和地球内部动力学2个方面介绍国际大洋钻探计划研究方向与钻探目标,前者主要试图了解地球气候变化历史与规律、海平面变化的原因与影响以及通过沉积物、液体和细菌等研究了解全球碳循环、气水合物形成和深海生物资源等重要问题;后者主要试图探测地球深部热与物质的转换、调查岩石圈变形与地震形成过程。同时,也介绍了ODP提出的3个挑战性项目,即自然气候变化和气候剧变原因、地质过程的现场监测和大陆边缘与洋壳深部结构探测。
电气石岩——一种和矿化有关的岩石类型
,韩发
矿床地质 , 1992,
Abstract:
猪肝和猪尿中沙丁胺醇和克伦特罗残留的酶联免疫吸附检测法研究
王建平,
牲畜兽医学报 , 2005,
Abstract: ?采用混合酸酐法将沙丁胺醇与牛血清白蛋白偶联,并免疫家兔制备抗沙丁胺醇抗血清。以间接elisa法测定血清效价,测得抗血清最佳工作浓度为1∶6400,该抗沙丁胺醇抗血清对克伦特罗有110%的交叉反应性。建立了能够同时检测sal和cl的间接竞争elisa方法,该方法对沙丁胺醇的检测范围为0.48ng/ml~8.0μg/ml,对克伦特罗的检测范围为0.43ng/ml~7.3μg/ml,对沙丁胺醇的检测灵敏度为0.48ng/ml,对克伦特罗的检测灵敏度为0.43ng/ml。在猪肝和猪尿中添加1~50ng/g(ng/ml)的沙丁胺醇,添加回收率为72.2%~84.8%,变异系数为4.2%~28.3%,在猪肝脏和猪尿中添加1~50ng/g(ng/ml)的克伦特罗,添加回收率为84.3%~103.4%,变异系数为0.3%~35.5%。
Step scan time resolved spectroscopy and its application to photoconductivity of Si solar cells
步进扫描时间分辨光谱及其在太阳电池光电导上的应用

,
物理学报 , 2004,
Abstract: We report on the establishment of Fourier transform step-scan time-resolved photoconductivity spectroscopy to study the solar cell's minority carrier lifetime,which has close relationship with its conversion efficiency.Three typical Si solar cells are selected in our experiments,including both the monocrystalline and polycrystalline silicon samples.We find that the rise and decay curves of the transient photoconductivity can be well described by two simple exponential functions.Due to the participation of recombination centers,the recombination minority carrier lifetimes are generally smaller than those of generation.In order to prove the reliability of our experimental results,we extract the bulk lifetime and the effective diffusion length of the three samples.Furthermore,we analyze the correlation of the minority lifetime with the short-circuit current,open voltage and conversion efficiency,by the aid of the investigation of solar cells' dark I-V characteristics and load characteristics.In addition,we also discuss in detail other applications of the established step-scan time-resolved spectroscopy.
HHP花岗岩和喷气沉积贱金属硫化物矿床间的成因关系
,张效民
地球学报 , 1994,
Abstract: 热源一直是沉积喷气型块状硫化物矿床成因模式难以解决的阿题.在该类矿床下盘岩石中HHP花岗岩的发现为其问题的解决提供了新途径。HHP花岗岩含有很高的放射性U、Th和K,能长期持续地提供热能.从而在上覆沉积岩中驱动热液对流循环系统。如果保持中等程度高的渗透率.一个宽大于10km的HHP花岗岩驱动并维持热液对流循环系统脉动性地活动10^5-10^4a.耶么温度为235℃.且最初由花岗岩缓冲的还原卤水能提供10Mt铅锌,所以确定HHP花岗岩及其形成时代有助于大型Sedex矿床的发现。
接枝丙烯酸对聚偏氟乙烯膜表面亲水改性的研究
Studies on Surface Modification of PVDF Membranes by UV Grafted Acrylic Acid
 [PDF]

, 区文仕, 吴业辉, 王希,,
Hans Journal of Chemical Engineering and Technology (HJCET) , 2013, DOI: 10.12677/HJCET.2013.34023
Abstract: 为了改善传统聚偏氟乙烯(PVDF)亲水性不强的缺点,本研究以二苯甲酮(BP)为光引发剂,通过紫外光照,将亲水性单体丙烯酸接枝于PVDF膜的表面。通过测试纯水接触角和吸水率的表征值,考察PVDF膜改性前后的亲水性的变化,并且确定了引发剂浓度、辐照时间等因素对接枝率的影响。结果发现接枝后的PVDF膜的亲水性得到明显改善,而且随着光引发剂浓度的增大,丙烯酸的接枝率先增大而后在一定区间内保持稳定。本实验还通过衰减全反射光谱和扫描电子显微镜图片对接枝后PVDF膜表面化学组成和微观形貌进行了表征。
To improve the hydrophilic property for the traditional PVDF, acrylic acid was grafted onto the surface of PVDF membrane by UV irradiation grafting polymerization with benzophenone as photo-initiator. The static contact angle and water absorption ratio were used to study the changes of hydrophilic property of modified PVDF membranes, and the principal factors influenced the grating degree were discussed, such as the concentration of photo-initiator, irra-diation time. The results showed that the hydrophilic property of PVDF membranes was improved significantly, and with the increase of the concentration of photo-initiator, the degree of grafting increased first, then stayed stable in a certain range. We also used attenuated total reflection-Fourier transform infrared spectroscopy and scanning electron mi-croscopy to characterize the chemical structure and morphological changes of the original and modified PVDF membrane.
随时间发展的三维混合层流场的研究
利平,,傅斌
力学学报 , 1996, DOI: 10.6052/0459-1879-1996-1-1995-296
Abstract: 构造了三维混合层流场用离散涡丝描述的计算模型并进行了数值模拟.给出了流场的涡结构以及不同剪切率、不同扰劝强度下涡结构的特征,得到了流场中的平均速度、动量厚度.由计算被动粒子显示了流场螺旋涡结构的图像.做了相应的流动显示实验研究,所得结果与计算结果非常相近.本研究为了解该流场并由此进行流场控制提供了依据.
气体爆炸过程的原型实验
,杜杨,
力学与实践 , 2003, DOI: 10.6052/1000-0992-2002-324
Abstract: 在7.2m2﹡600m的大断面地下原型坑道中进行了可燃气体的爆炸实验,通过光电火焰传感器和压阻传感器测试爆炸过程中火焰和压力信号,得到了地下原型坑道中气体爆炸过程的基本参数,揭示了爆炸过程中组分、边界扰动、紊流对爆炸发展影响的规律.
HHP花岗岩和喷气沉积贱金属硫化物矿床间的成因关系
,张效民
地球学报 , 1993,
Abstract: 热源一直是沉积喷气型块状硫化物矿床成因模式难以解决的阿题.在该类矿床下盘岩石中HHP花岗岩的发现为其问题的解决提供了新途径。HHP花岗岩含有很高的放射性U、Th和K,能长期持续地提供热能.从而在上覆沉积岩中驱动热液对流循环系统。如果保持中等程度高的渗透率.一个宽大于10km的HHP花岗岩驱动并维持热液对流循环系统脉动性地活动10^5-10^4a.耶么温度为235℃.且最初由花岗岩缓冲的还原卤水能提供10Mt铅锌,所以确定HHP花岗岩及其形成时代有助于大型Sedex矿床的发现。
爱多收对大鼠的生殖毒性研究
肖希龙,
牲畜兽医学报 , 1995,
Abstract:
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